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1

Worker genetic diversity and infection by Nosema apis in honey bee colonies

100%
Woyciechowski M., Krol E.
Folia Biologica
|
2001
|
vol. 49
|
issue 1-2
107-112
EN
The hypothesis that parasites and pathogens select for polyandry in eusocial Hymenoptera was tested, using the honey bee Apis mellifera and its microsporidian parasite Nosema apis. Five honey bee colonies with low and five with high worker genetic diversity were infected with N. apis spores. At 54-56 days after inoculation, parasite spores in the workers? midguts were counted to determine whether there was a greater variation of infection intensity (spore counts per worker) in high-diversity colonies than in low-diversity ones. In all colonies there were two discrete sets of workers, with few or many parasite spores. To compare the variations of infection intensity between two colony groups, coefficients of variation were calculated for all workers examined, and for the slightly infected and strongly infected workers. The percentages of slightly infected workers in the low- and high-diversity groups were also compared. None of the comparisons between low- and high-diversity colonies showed significant differences, therefore no relation was found between honey bee workers? genetic diversity and their infection with N. apis.
2

Bi-paternal litter in Finn raccoon (Nyctereutes procyonoides Gray 1834) detected by polymorphic DNA markers

88%
Slaska B., Jezewska G.
Folia Biologica
|
2008
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vol. 56
|
issue 3-4
193-195
EN
The present paper demonstrates novel results confirming the phenomenon of multipaternity in Finn raccoons. The purpose of the study was to affirm the occurrence of bi-paternal litters in Finn raccoons using polymorphic microsatellite markers. The study was carried out on 37 Finn raccoon females, males that mated with them and the resulting offspring (176 individuals). The offspring came from females mating with two or three different males during one estrus. Parentage testing of 15microsatellites was used inthe present study. Based on genetic analysis including the control of the origin of the Finn raccoons, it was observed that in the case of double-mating with two different males, as well as triple-mating with three different males, there were 47.06% and 54.55%, respectively, of maternal half-sibs, i.e., animals born in one litter but with different fathers. Paternity was wrongly ascribed in 18.2% of the offspring in the examined Finn raccoon population. The conducted research indicates a necessity to check the origin of young animals selected for breeding stock in Finn raccoon breeding farms.
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